|Adding a rear brake to a Pista frame?...||SS_MB-7|
Apr 9, 2003 12:24 PM
|While I was having 2 sets of water bottle bosses added to my '03 Pista frame by a trusty LBS mechanic on Friday, I asked about the possibility of adding a rear brake to the Pista since I will be racing the bike at a couple local races (48x17 freewheel -- fixed-gears are not allowed). He looked at the rear brake arch and seemed to think it wouldn't be a problem. He didn't have much time that night so I didn't press him to much on it, but I'm hoping to have one installed in the future. |
One of my concerns is that the arch is not reinforced internally to account for the tightening stresses created by tightening the brake bolt and crimping the arch. There are likely ways around this though with washers, etc to distribute the compression forces.
Has anyone added a rear brake to a Pista (or any other) frame that did not already have a mount? Are there any problems with doing this?
Apr 9, 2003 1:00 PM
|When you apply the brake, it's going to torque the arch, too, won't it?
I'd worry about the arch not being reinforced, either for the tightening force or the brake torque.
Maybe put some sort of sleeve around the arch?
|Check the reach...||biknben|
Apr 10, 2003 5:02 AM
|Be sure the bridge is in the right spot for a brake. If it is too high on the seatstay a brake won't reach the rim.
The forces that you and Doug mentioned are also a concern IMO. If Bianchi used the same tubing and welds that would be used on a regular frame then you will be fine. If they used thinner tubing or a minimal weld, you may cause a failure. Kiss your warrantee good-bye too.
I'd compare the dimensions and welds to another Bianchi frame intended for a rear brake. If they look the same I would be comfortable with a drill. Since the Pista is a "relatively" inexpensive frame, I doubt they went to great lengths to redesign the brake arch for use without a brake.
Apr 10, 2003 9:56 AM
|In most frames, the brake arch has a beefy metal block in the center to accept the bolt. On the Pista, the arch is plain round tubing. Aside from the block, I can't tell if it's different.